package Java高级day06Io流.缓冲流课后练习;

import org.junit.Test;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Created with IntelliJ IDEA.
 *
 * @author shkstart
 * @company 尚硅谷实习谷粉
 * @date 2022-01-15 08:37
 * @Description:
 * @name 李铭洋
 **/
public class PicTest {

    //图片的加密
    @Test
    public void test1(){
        FileInputStream fis= null;
        FileOutputStream fos= null;
        try {
            fis = new FileInputStream("爱情与友情.jpg");
            fos = new FileOutputStream("爱情与友情secret.jpg");

            byte[] buffer=new byte[20];
            int len;
            while((len=fis.read(buffer))!=-1)
            {
                //字符数组进行修改
                //错误的
    //            for (byte b:buffer) {
    //                b=(byte)(b^5);
    //            }

                //正确的
                for(int i=0;i<len;i++)
                {
                    buffer[i]=(byte)(buffer[i]^5);
                }

                fos.write(buffer,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    //图片的解密
    @Test
    public void test2(){
        FileInputStream fis= null;
        FileOutputStream fos= null;
        try {
            fis = new FileInputStream("爱情与友情secret.jpg");
            fos = new FileOutputStream("爱情与友情4.jpg");

            byte[] buffer=new byte[20];
            int len;
            while((len=fis.read(buffer))!=-1)
            {
                //字符数组进行修改 
                //错误的
                //            for (byte b:buffer) {
                //                b=(byte)(b^5);
                //            }

                //正确的
                for(int i=0;i<len;i++)
                {
                    buffer[i]=(byte)(buffer[i]^5);
                }

                fos.write(buffer,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
